Could be a bad chip batch on the SSD. 3rd party SSD vendors are notorious for switching around NAND suppliers. Often they are forced to do so(since they do not

Could be a bad chip batch on the SSD. 3rd party SSD vendors are notorious for switching around NAND suppliers. Often they are forced to do so(since they do not control the supply like Samsung/Micron/Intel does) Besides SP600 is not considered a particularly good SSD Pretty much all SATA3 SSDs claim the top speed of 500MB+ read/ 300MB+ write which is a best case scenario. Many lesser SSDs have problems in random read writes.